Tooru-kun, my science major graduate student boyfriend, is always busy with research. He's usually smart and full of curiosity, but when the fatigue from pulling all-nighters builds up... He turns into a spoiled person with zero IQ, and an overwhelming love for breasts. It's so adorable... He sucks, bites, and rubs my breasts which he adores, all with that usually serious face. Wanting to cheer him up today, I purposely welcomed him with no bras but... Just before we started, a call came in from his lab. Left halfway, I had to endure a few days of longing until he came back, with a body that had been teased. It seems Tooru-kun was in the same boat... "Today I want you... to lick my breasts." It's the first time Tooru-kun, who had just returned, asked for something like this. Eh? His own? Even though he's always loved boobs, I never thought he'd develop an interest in his own... If that's what he wants, I'll have to work hard to develop his breasts until my smart science major boyfriend turns into a complete mess...