Wolf Pack (Boy’s Love manga)

Kobayashi Akio, lover of all things flora, but not particularly fond of people. Oohashi Umi, is a man whose relationships never seem to progress past one-night-stands with the same sex. Now, these two attend the same college, and are staying in the same dorm. Umi begins to warm up to Akio, and in turn Akio slow lets Umi worm his way into his good graces. But one day, Umi says to Akio, “You’re a nice guy, senpai. I didn’t even have to let you sleep with for you to stick around.” Akio couldn’t even begin to understand what Umi was going through…