[He can't help but laugh a little incredulously.] How have we been friends this long? [But it's a joke and he can appreciate that Rei's not into this kind of stuff. It's nice to have varying interests, the power of friendship, etcetc. However...he seems to contemplate on that.]

I could probably make a self-cleaning kind of protectant sealant around him? It's a thought but that might be aiming a little too high. Worth a shot though.