Forbidden Love Yaoi

Biological brothers, twins
Ch.3 - The Way to Nurture Love - Salaryman Kei got dragged to a gay bar and told to pick his type, so he accidentally picked his estranged twin brother Yuu at random. Yuu seems to be living life as a woman now, and Kei can't help but worry, so he invites Yuu to live with him. But the longer they live together, the more the feelings from their past that forced Yuu to leave seem to come back.
Trigger warning: incest(brothers), transphobia.

Biological brothers, twins
A tragic oneshot about twins in love. The younger twin just wants to protect his shut-in brother, and he's willing to do it no matter what the cost. Upsetting and not for everyone.
Trigger warnings: incest, abuse, murder.

Biological brothers, twins
A distorted relationships between twins where the younger twin tried to assault his brother once, and now messes around in school. When the older twin tells him to get it together, he says he'll do it in return for a wish. Pretty messy relationship that left a bad taste in my mouth.
Trigger warning: incest, rape.

Biological brothers, twins (threesome)
Childhood friend of twins sees the two of them getting physical, but when they see him, they admit they've really been wanting all three to be together for a long time.
Trigger warning: incest.

Biological brothers, threesome
Kouhei always worries about his younger twin brothers, finally gets a matchmaking session, and this spurs his brothers to confess.

Guardian x amnesiac
Tomohisa and Yuuta live a peaceful life on an island, with Tomohisa taking care of the very child-like amnesiac Yuuta. But they also have sex. Turns out there's a whole backstory but yeah, probably still shouldn't do that.

Stepfather x stepson
Kazuyoshi is living with the stepdad who took him in and raised him, but now he's started to touch himself to thoughts of his stepdad and when he finds him asleep one night, he's about to go further.

Adopted father x son
Yuichiro took in his best friend’s son Akito and raised him with all the love in the world, but now Akito is ready to take things to the next level

Foster-father x son
Teen boy loses his father, gets adopted by a sexy company president.
Trigger warning: incest themes(guardian x ward), statutory rape(?).

Guardian x adopted son
Former yakuza Genji adopted a shapeshifting human who grew up and now wants to take their relationship further.