Don't Show Such a Sweet Face(2002)

Amai Kao wa Misenai de

One morning, Naoki, a new hire and a virgin, wakes up to find himself completely naked and next to him is a handsome man who is completely naked, too. That man is Takano, an intimidating manager who is in charge of training the newcomers! Takano gently asks Naoki, "Are you all right? Was last night too hard for you, a first-timer?"

Is this.... what losing my virginity is like?

(Source: Super BexBoy Comics, translated)