Some ideas:
Slower burn. The models in the screenshot and Jack the brat are nice but rushing to nude/explicit stuff kills the tension. And, imho, you want to build tension between your characters because that keeps the player engaged and wanting to get to the next thing. So far I have seen a couple of ways other games achieve this. To put it briefly, avoid revealing stuff too fast and avoid making your main interest characters too "porno" in the early game. For example, I find most of retsy's games do both of these really well - early naked scenes are blurred or from angles which keep things sexy and hot without gluttonizing on the graces of our main interest, and characters typically do not wear porny or skinny clothes (like they do e.g. in milftoon games).
So - peeking, touching (with progression hand, leg, butt, side tit, etc.), kissing (cheek, lips, tongue) and of course backlash for when things are taken too far for example touching breasts or trying to kiss on mouth then Jane's reaction should be reserved as in "that is not right" and if repeated "what the hell are you doing? / go to your room!".
With clothes you could also try a progression system. Baggier and less revealing clothes depending on characters stats, and progressing to sexier stuff if the character gains more confidence during the game.
Story arcs. What causes Dan and Michael to grow an interest toward Jane? Perhaps they are part of a "bodycount" club at school and want to go for the ultimate prize, or perhaps the recent divorce has stirred up some unhealthy competition between the guys in the sense of "who does mommy love the most?", or perhaps the competition has been going on for sometime and played a part in why Jane got divorced. Or perhaps one of the guys is a good kid who tries to save the family unit, while the other has some darker goals.
Or perhaps the dad characters is not yet totally out of the picture and Jane is trying to work it out but Dan/Michael has different oppinions.
Give the player more control on how sex scenes progress and especially where to finish - inside, tits, back, face, mouth, etc.
Don't forget the male sounds. When conquering the ultimate prize there needs to be grunts of victory, especially so during the climax :)
Limit the amount of characters. Jane, 3 kids, (maybe a dad / some other antagonist) + a couple of supporting characters. That is already 4/5 main characters and 2/3 supporting characters. And each new character means new content. Imo, few deep characters with plenty of content per character is always better than plenty of shallow characters and little content per character.
Bonne chance with the game!