Canon: Hanazakari no Kimitachi e or Hana-Kimi
Pairing: Kayashima Taiki/Nakatsu Shuuichi
Canon Level: Roommates

Aw, Kayashima and Nakatsu would be so sweet. Nakatsu is loud and energetic and prone to overreacting but also kind. Kayashima is rather odd and serious and is used to being alone because of it. But despite their opposite personalities, being roommates has worked out for them with a minimum of fuss. If Nakatsu were to get over Mizuki and accept his budding bisexuality, I think Kayashima has the potential to be Nakatsu's next crush, as someone he's already close to. And Kayashima would be drawn to Nakatsu and his bright aura. I think their first, awkward fumblings would be very awkward but that they would still trust each other not to hurt them unduly. And it would all be super cute.

Suggested reading:
A Little Ghostly Nudge by Settiai
All That I Have by Chash
Pink Auras and What To Do About Them by predilection