[ Iorveth has already made a mental list of things he can say to tease Astarion without actually offending him: obviously untrue things about his appearance is one (something he can get away with, since he's fairly certain that Astarion knows that Iorveth thinks he's infuriatingly pretty), threatening him with ugly sandals is another. Iorveth is also compiling a list of things he can say that will actually make Astarion upset, which he is trying to avoid, but occasionally says anyway because they hold true in the moment.

Right now, he's just having fun watching Astarion's expressions kaleidoscope under the sun. No one in Iorveth's past has been quite as expressive, though they've come close to being as dramatic. ]

I "get away with such things" because I'd enjoy being bent over your knee.

[ And thus, the so-called punishment would be smugly accepted, and Astarion would only be rewarding Iorveth for bad behavior. Freak elf strikes again. That said, he's not sure if he would actually enjoy any of that, but he just wants to see how Astarion would react. ]

How intolerable it must be for you that I love you so much.