I found the dev walkthrough to be lacking (I wanted to see all of the outcomes, not just one path). Since I was code diving to get a more complete look at what choices gave what relationship stats anyway, I decided to write them down for others to use if they want. If a choice doesn't show up in my guide, that means it didn't raise stats or set a flag. Also, the stat relationship increases take into account which character you are currently playing. So for instance, alka, refers to Alex's relationship with Kai (ALex/KAi). Similarly, niro, refers to Nick's relationship with Ronan (NIck/ROnan). Because all the others are self-explanatory besides AlVa, I'll just explain that it's Alex's relationship with the "Vampire" (you learn his name later).


Chapter 1:
"How do you respond?"
	Act normal: +5 AlKa 
	Flirt: +10 AlKa
	Confess nervous: -5 AlKa
	Say you're leaving: Leads to an early game end if you say "No, I'm done."

Chapter 2:
"What approach should Nick take?"
	Apologize: +10 NiRo
	Stay silent and wait: +5 NiRo
	Nick isn't defenseless. Threaten: -10 NiRo

Should Nick keep pressing for information, or leave?"
	Keep pressing: ch2 press = true
	Time to leave: +10 NiRo

Chapter 3:
"How do you respond to Santino?"
	I think this guy slipped me a roofie (truth?): +10 AlSa
	I had some vivid nightmares (truth?): +10 AlSa
	Everything is fine (lie): -5 AlSa
	
"Give yourself some attention or focus?"
	A little self-love never hurt: +10 AlVa and ch3 resist = false
	I really need to focus: +0 AlVa and ch3 resist = true

Chapter 4:
"How do you respond?"
	I think I need a lawyer (flirt): AlCo = true
	Sorry but I'm not interested (reject): no changes but you don't get the flag with Connor

If AlCo = true:
	"How does Alex respond?"
		Ask for more details: +5 AlSa
		Thank him for the warning: +10 AlSa
		Tell him not to worry: no changes

"How do you respond to Santino?"
	It's been bothering me: +10 AlSa
	I haven't thought much about it: -5 AlSa

Chapter 5:
"How do you respond?"
	Always happy to help (Cooperative): +5 AlNi
	Why me? (Questioning): no change
	Make an appointment (defensive): no change

Chapter 6:
"How do you react to this compromising situation?"
	It's not that strange. Act normal: +10 AlNi
	When opportunity knocks, flirt: -5 AlNi
		Apologize: +5 AlNi
		Just move on: -5 AlNi, +5 AlVa
	Make a self-deprecating joke: +10 AlNi

"How do you react in this situation?"
	Don't deflect, but try to assert: +10 AlNi
	Admit you're scared and ask for help: +5 AlNi
	Try to avoid the conversation: no change

"How does Alex feel about this realization?"
	Reject the feeling: no change
	Explore the feeling: +10 AlVa

[If Alex's relationship with Nick is >= 9]
	[If Alex's relationship with Vampire <= 9]Invite him to use spare bed (Respectful): +10 AlNi
		[If Alex's relationship with Nick >=29] you can choose to have sex or not
			If Alex says yes to sex with Nick
				"Do you want Nick to call you his bitch?"
					Yes: -5 AlNi
					No: +5 AlNi
	Suggest you hook up (flirt): -5 AlNi
	Let him leave (respectful): +5 AlNi

Chapter 7:
Alex has the choice to go home with either Connor or Kai. In this chapter it doesn't seem to lead to any relationship stat changes. Just choose who you want, both of them give some explanation as to what happened to Alex that night at the hotel.

In this chapter there's also flags for ch7_press +=2 and ch7_press += 1, that I have no idea what triggers them. The latter one you get then leads to you being with Kai but ultimately not going home with him. As far as I can see in the code, you have to choose either Connor or Kai to take you home, and they take you all the way home so maybe this part is code that hasn't made it into the game yet or was cut/unfinished.
	
Chapter 8:
"Have you ever had sex while shifted"
	The answer to this question sets either a sex_werewolf = true flag or nothing. Opens up or closes the possibility of fucking a fully shifted werewolf later on.

"How do you know him?"
	He hunts vampires but disappeared: connorknowsnick = true
	He's a friend but disappeared: no change

"Would you like me to try to find him?"
	[If connorknowsnick = true] Yes: connorlooksnick = true
	[If connorknowsnick = false] Yes (keep nick's secret): connorlooksnick = true
	[If connorknowsnick = false] Yes (tell nick's secret): connorknowsnick = true and connorlooksnick = true
	No: no flags set

You can choose to have sex with Connor or not.

"How do you respond?"
	I am, thank you: +5 AlVa
	A little too comfortable: no change
	No. I don't trust you: no change

"How do you respond?"
	Apologize: +10 AlVa
	Don't apologize: no change

"How do you respond?"
	He's some kind of vampire (full truth): toldsantino +=2 and +10 AlSa
	He is responsible for what happened to me (partial truth): toldsantino +=1 and +5 AlSa
	Let's just talk about the offer (hide truth): -5 AlSa

If Alex's relationship with Santino >=20, you can accept Santino's hug, then accept his flirting, and then get the option to have sex with him or not. 

Chapter 9
[If Nick masturbates]
	Nick imagines Alex
		Alex is bottom: ch9 fantasy = 2, +10 AlNi, -5 NiRo
			"Does Nick tell Alex to kiss him?"
				Yes: -5 NiRo, +5 AlNi
				No: -5 NiRo
		Alex is top: ch9 fantasy = 1, +10 AlNi, -5 NiRo
			"Does Nick tell Alex to kiss him?"
				Yes: -5 NiRo, +5 AlNi
				No: -5 NiRo
	Nick imagines Ronan
		Ronan is bottom: ch9 fantasy = 4, +10 NiRo, -5 AlNi
			"Does Nick kiss Ronan?"
				Yes: +5 NiRo, -5 AlNi
				No: +5 NiRo
		Ronan is top: ch9 fantasy = 3, +10 NiRo, -5 AlNi
			"Does Nick tell Ronan to kiss him?"
				Yes: +10 NiRo
				No: no change
	Nick focuses on himself: ch9 fantasy = 5	

[If Nick masturbated to thoughts of Ronan]
	"How does Nick react?"
		Insult his lack of control: -10 NiRo
		Apologize: +5 NiRo
		Flirt: +10 NiRo

[If Nick masturbated to thoughts of Alex]
	"What does Nick do?"
		Ask what's upsetting him: no change
		Make a joke: -5 NiRo
		Ask him to leave: no change

Chapter 10:
"Does Nick take a closer look?"
	Yes: no change
	No: sex_werewolf = false (basically saying the PC isn't interested in Nick fucking a shifted werewolf)

"How is Alex feeling right now?"
	That was a bit of a turn on: 5 sub points
	He's a complete jerk: 5 dom points

"How do you respond?"
	Tell Ronan to back off (aggressive): 5 dom points
	Point out Mayhew wants your help (subtle): 5 sub points, +5 AlRo

"Do you correct Nick on the term vampire?"
	Yes: -5 AlNi, +5 AlVa
	No: no change

"Do you ignore Ronan?"
	Ignore: 5 sub points
	Tell him to shut up: 5 dom points

"How do you respond?"
	I still know more (bossy): 5 dom points
	Let me help (submissive): 5 sub points

"How do you respond?"
	I do care: 5 sub points
	You're right, I don't: 5 dom points

Chapter 11:
"What do you say?"
	I'm leaning towards accepting: +5 AlVa, -5 AlNi
	I'm just thinking about it right now: no change
	No, I don't think I can trust him: -5 AlVa, +5 AlNi

"Do you say anything?"
	Yes, stand up for Seth: -5 AlVa, +5 AlNi, 10 dom points, ch11_protectedseth = true
	Yes, but it's none of your business: +10 AlVa, -10 AlNi, -10 NiRo, +10 AlRo, 10 sub points
	No, stay quiet: +5 AlRo, 5 sub points, ch11_protectedseth = true

"What do you say?"
	I want to take them down from inside (Truth): ch11_truthorlie = true, +10 AlNi, -10 AlVa
	I want to take them down from inside (Lie): ch11_truthorlie = false, +10 AlVa, -5 AlNi
	I need more time to think: +5 AlNi

"How are you feeling about the prospect?"
	I'd probably accept: +5 AlVa
	I really don't know: no change
	I don't think I would accept: -5 AlVa

You can choose for Alex to have a threesome with Connor and Seth, or not.

[If you deny threesome and go home]
	Give myself some relief: ch11_solo = true
	I'm not giving into these urges: -5 AlVa

"What do you say?"
	You still looked good to me (flirty): +5 AlNi
	I'm glad it healed (serious): no change

"What do you say?"
	Do you still care about him: ch11_redeemronan = true, +5 NiRo
	Do we have to take him down too: no change

[If Alex's relationship with Nick >=20]
	"What do you say?"
		I want you, but Ronan warned me: ch11_thetriangle = 1, +10 AlNi, -5 NiRo
		[If ch11_redeemronan = true] Ronan still has your heart: ch11_thetriangle = 2, +5 NiRo
		Keep it as friends: ch11_thetriangle = 3

"What are Nick's thoughts on Alex?"
	[If Alex's relationship with Nick >=20] I like him: c11_nickwantsalex = true
	[If Alex and Nick hooked up in ch6] Back off, don't want competition: c11_nickwantsalex = true
	I'm not sure: no change
	[If Alex's relationship with Nick <=10] All yours, kid: c11_nickrejectsalex = true

"What do you say?"
	[If Alex hasn't told Santino about Mayhew] Mayhew isn't quite human: toldsantino = +2, +5 AlSa
	Not only is Mayhew different but werewolves: toldsantino = +1, +5 AlSa
	Apparently this plague is more than a virus: toldsantino = +1, +5 AlSa
	Nothing else: no change unless toldsantino <=2 then -10 AlSa