(Katekyo Hitman Reborn! / Mukuro X Tsuna) Sweet Agony

A Valentine's Day story. Short, and possibly not very tasty. I haven't written Mukuro and Tsuna in ages, so here's a writing warm-up. The more I write, the more I feel like I can't figure out how Mukuro and Tsuna are supposed to be _(:зゝ∠)_ Premise: