Hmm, I have to admit, I didn't expect to find a lot for this one. The games+ section seldom interests me. The top of the list is poorer matches, the lower list, with links are better matches. Good luck.
ALT CTRL DEL; family traveling through alternate dimensions, having incestuous pairing all over the place. Mom is deff. in on it.
Grandma's House; There is a lot of near-blood relations in this. Including a multigenerational redhead family where the mom is gung-ho on the harem thing.
How to Lose One's Virginity; mom is trying to get son to hook up with the youngest (18ish) girl toward the end, after getting some herself.
Light of My Life; Father and two daughters work toward a thruple relationship. Dream/phantasm mom is all in.
Mythic Manor; House mom is ok with MC tapping everyone he see's, including his bio mom if she where in the picture.
Power Vacuum; mom isn't exactly on board, but MC is banging everyone and it feels right to recommend.
Single Again; Oldest sister takes a mom role in the family and is trying to get dad into everyones pants.
Cabin by the Lake; The hook of this game is that the story is very choose-your-own-adventure. If you choose mom to be involved she is.
Goodnight Kiss: Sugar and Spice; the little mom is in the story, she is ready to do anything she is asked. Not a great match, but one of the better candidates in this list.
Harem Residence; sister has a very 'mom' role in the story and is pretty set on getting MC laid by anyone with a pulse.
Heritage; all parental figures are gung-ho for incest. But the game doesn't feel like "Idle Hands" in any way.
In for a Penny; This story is all over the place, but every authority figure is trying to get everyone to fuck MC.
Live in Corruption; mom isn't exactly on board with her daughter and the MC, but it still feels right to suggest.
Milfy Day; incest heavy, not sure mom is trying to get MC into anyone elses pants, I don't recall.
My Dorm; fits the themes you asked for, but doesn't fit the feel. Still worth looking at.
My New Family; mom is less interested in you banging everyone, as she is you being a good partner to everyone in your harem, which is everyone. This game is a classic, and pretty darn good. But doesn't fit the feel of "IH".
Bad Hero; strongly fits the "IH" feel.
Cartel Simulator; I don't recall strongly, but I think this fits.
Corruption (Mr.C); less a VN, more a giant seduce anything with a pulse. Mom is on board.
Drive to Nowhere; This feels right to recommend, though it's not a good match.
Going for Goal; plot light, but feels right to recomend.
Kindread: The Redburns; mom is totally not on board, but this feels appropriate to suggest.
Lockdown 2024; mom is activly trying to cock-block you, you're going behind her back.
My New Memories; mom is out of the picture, but she'd be in bed with you while you fucked everyone. same creator as My New Family. Very worth looking into.
My Pervy Poltergeist; Your ghost roommate is voyeristically trying to get you laid.
Pony Waifu Sim; Straight up MLP porn. Your roommate is trying to get you into everyone's... manger? Don't bother, unless cloping (I think that right) appeals to you. (In my defense, this was recommended by a brony ex-girlfriend)
True Husband; feels right to recommend.
Apocalypse: Poorly recalled, feels appropriate to recommend.
But I'm the Bad Guy?; Feels right.
Diary of my perversion; This fits.
Little Green Hill; this one fit well.
Malignant: feels right to recommend...
My Daughter Forever: not completely sure this fit, but it feels right.
SUCH A SHARP PAIN: mom is not on board. But still feels right to suggest.
In the Sound of Silence: doesn't fit your request, but feels right to suggest.
