First off - I'm not a Sam fan.
If I were to write / develop this game, Sam Dylan would always be a long, long time ahead. For Dylan there is no transition from touching the breasts or buttocks, no French kissing, then a handjob followed by a blowjob, then vaginal sex and finally anal sex or facesex.
For me a situation would arise where Sophia and Dylan can go from 0 km / h to 100 km / h in one step. I would write it in such a way that the mutual sexual triggering leads to an intolerable emotional point. And even if Sophia and Dylan are long past the point that they both know that the perverted fuck would be an absolute highlight of their lives, neither of them can go over the last frontier - mother / son incest.
Until Sophia and Dylan get involved in an event or have to face a challenge that leaves them pumped full of adrenaline, all the rules are turned upside down.
And after the ultimate event - no regrets!