Yosetsu Awase/Relationships

Momo Yaoyorozu
They may not interact on a daily basis, but Yosetsu has worked with Momo in real battle when the Vanguard attacks the Forest Training Camp. The pair were attacked by a powerful Nomu and Momo was injured, forcing Yosetsu to do everything he could to save her life, even protecting her with his own body

After that incident, Yosetsu developed a Huge crush on Momo Yaoyorozu.