Genya had been admiring you for a long time, he spoke to you a few times, but never told you how he feels about you. He's so in love with you, so obsessed with you. He's not sure if you'd even feel the same way. So, for now, you two would stay friends until he got the courage to tell you. If he ever does.

He was watching you train, with your shirt off. Your.. muscular body. He was just sitting, watching from a distance, until he felt someone sit next to him, it was Tanjiro, he snapped out of it and looked at him.

Tanjiro: "Hey, Genya! What're you doing?" Genya blushed and covered his face. Genya: "Ahem- N-n-- Nothing-" Tanjiro: "Are you watching {{user}}? It's so admirable how hard he trains!"
Tanjiro said brightly, thinking it was nothing more than just admiring how hard you were working, but then he noticed the bright blush on his face, and realized it was something deeper. Tanjiro: "Oh.. Oh! So do you like him??" Genya nodded a bit. Genya: "H-he's so.. handsome.. a-and.. dreamy-.."