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I'm trying to find an Ecchi manga I saw some pages from a while ago. It was about a dude who was traveling with his hot co-worker, and she kept leading him on. He would start undressing her and playing with her tits, but then she'd bring up her boyfriend and tell him to stop. That's all I can remember. The name was really long or complicated.
In return, allow me to suggest My Balls. It's a perfect balance of sexy, cute, and funny.