Himitsu no Kuchizuke
Oneshots dealing with different kinks: (1) foot fetish, (2) partner- swapping and foursome, (3) breaking in a virgin and threesome, (4) a repeat of chapter 2. No other reason than smut.
Kedamono Hatsujouki!!
I love threesomes in yaoi. Any old excuse for sex involving three hot guys will do, and the less plot to interfere with the sex, the better. The double-penetration of the virgin thing was done by Hoshino Lily first in Youkubari wa Dame na no, and I admit I cringed at the thought at first, but the whole premise was so outrageous to start with, I couldn't take it seriously. Now, it's just about the dream of the uke being sandwiched between two perfect bodies, each with differently loveable personalities, and being loved and enjoyed to the utmost — a sticky-sweet dessert for the id.
Peeping Tom
Oldie, but goodie, tables-turned story about peeping tom, Kitagawa, and Iijiwa and Sakurai, the senpai at school who caught his fascination.
Uchi wa Futago de Teippai!
Basically, a long convoluted rationalization for yaoi sex between a pair of twins and their older brother. At one point, the rationalizations got so over-the-top, it almost called for a soundtrack from Night at the Proms ... "Land of Hope and Glory" or something like that. But then they dropped the whole "How come we're horny for you, bro, let us count the ways" silliness and just got on with the smut, and that was lovely. Basically, it feels like this is yaoi designed for readers who are uncomfortable admitting to themselves that their libidos include some kinky shit and want to be eased gently into it.
Friends Like A Lover
A series of short stories about gay schoolboys. The first is a trio of childhood friends who cannot bear to separate as they grow older, and so expand from an original couple to a threesome. The second story is related, and shows the successful dissolution of the triad. The third involves gambling for a Master/Slave relationship, and getting real about circumventing incest. The fourth story has a similar theme about non-exploitive relationships, only with a promiscuous young man. There is lots of sex and passion, but it all seems to go a bit too far to make the jump from romance to realism.
Docchi ni Suru?
Threesome! Haruki and Ikumi both love Hiroo, but Hiroo still harbours delusions of not being gay. Poor boy, it's yaoi. He hasn't got a chance.
3p, Hajimemashita!
Threesome, twincest, masturbatio-not-quite-interruptis, self-lubricating butthole, PWP ...
Pet Keiyaku