ok so if anyone is interested after a long and arduous journey i have finally found out how to unlock the sage and quinn threesome ( 4 fucking hours later i fucking hate dpc!!!!)
ok so in order to unlock the sex scene you have to have done all of these 4 things (if you dont it wont happen and you'll be locked out of it)
1. maximum dik affinty before the party planning scene,
2. be only on the sage/quinn path ( so no jill maya/josey or isabella paths simutaniously occuring as well)
3.get the cluck photo with quinn in the hot party, and
4. not be rejected by quinn earlier in the episode and make out with her.
1. dik affinity is pretty easy either only do dik stuff or just use scrappys mod and cheat
2. sage/quinn path only this is because if you are on any other path quinn will straight up reject you, i dont know why this is the case Jills path is the only one that has any reprecussions related to quinn but for some reason if your banging anyone else she just does
3. in order to get the cluck photo you have to get quinn a drink at the hot party and hook up with her in the previous episodes
4. in order to not get rejected by quinn in episode 8 you have to both trigger the library scene with her which you do by having dik affinity and hooking up with her in both episode 6 and 7 and also not be on the jill path because quinn will overhear her asking you out in the library and will reject you when you go talk to her, if you get the library scene and dont get rejected you'll end up outside with quinn later and make out with her automatically.
if you do all these and it still doesn't happen try switching up the choices in the blindfold scenes thats the only other thing i did when i unlocked it. hope anyone who hasn't figured it out yet enjoys this. also by going for the threesome you currently effectively lock yourself out of the jill path even with scrappys mod as in order to continue her path you have to have dinner with her friends which you cant do if you want bang both quinn and sage
Good summary, but just to note it
is possible to not be on Quinn's path and still get the threesome with Sage. If you're on Sage's route and also DIK, Quinn will go for it, but she will also say "I don't even like this guy". (You also miss her being nice/bickering with you in the pre-lewd scenes).
I've counted at least four variations to the party planning sequence (there may be more):
Sage/no Quinn path (if also DIK, then lewd scene. Quinn tolerates MC, probably because of affinity).
Sage/no Quinn path (if also CHICK, then no lewd scene. Quinn actively can't stand MC).
Quinn/no Sage path (no lewd scene but you do get the scene with Quinn afterwards. Lack of active Sage route is the issue).
Sage/Quinn path (lewd scene, plus Quinn scene afterwards. Both girls are into MC).
anone got gas? 
