Futago Danjo Aru Aru
This is a famous one shot online
Aniki no Ichiban Oishii Tokoro
Uhhhh If anyone asks me of this, I'll absolutely act like I don't know it but I actually liked it
Haitoku BL
"anthology of immoral/tabo bl" it really is. The 1st couple is an uncle and nephew, the uncle who fell for his sister's husband which we don't know if it was before marriage or after. The age gap is there too, it shows but I liked it, nonetheless. The 2nd couple r identical twins and u can see, they r filling the gap each other have. Their world revolves around one another and r so blind to see anyone else. When one did, and one fell for another, he still choosed his twin. I think that's admirable haha.
Kuro X Koi
3 stories and r confusing asf 1st is about the teacher and the uncle Older bottom twin x Younger top twin 2nd about the younger twin of the teacher and the father of the kid who the 1st twin teachers Younger twin bottom x older twin top 3rd the kid and his childhood friend (The most normal story out there)
Katakoi Opera