Futago no Musuko wa Papa no Ai ni Uete Iru

While working at his job as a university professor, Noboru gets a surprise visit from Kuro and Shiro, two young men who–due to some messy circumstances involving a neighbor and un-filed paperwork–are technically his adoptive sons, even though they only knew each other for a year. He’s surprised to learn they still remember him, let alone still consider him their “daddy”… but could they find a way to express their affection that doesn’t involve trying to get into his pants!?.