[Tempting as it is to go full over-protective big brother mode, truth be told, it doesn't bother him. Lumine can "spar" with whoever she wants, and honestly, he'd just much rather not have to hear about his sister's sex life. Especially when it's coming from anyone but her.]

[...]

[He's still gonna tease a little, though--]

Really! That must have been some spar, then. I know she's pretty tough. But looking at you, I can see she has good taste in sparring partners.

[Sparring is just a euphemism now.]