I'll tell them next time.

[He was learning and it wasn't something he'd forget.]

It's not important.

[Ren liked the way Mizuki looked when he blushed. He moves closer, small step by small step until he's right in front of him.]

I was told that people blush when they're happy or feel pleasure. That it's a natural physical response that can't be helped.

[With his free hand, he reaches up and runs his fingers across Mizuki's cheek. His expression is own of curious awe.]

Have you had a lot of sex?