Yes, progress through it enough, it'll unlock the option of seeing cuckolding/threesome scenes during the endings with Derek.
- You need to have level 3 Ring of Compulsion (with use for the day) - from the mechanic storyline
- You need to see the fuck with Vance before
- Afterwards, go to the after-work party and there will be more option during the confrontation in the garage
*Remember to always save before making any ending decision.