Well, you should put it wherever you want! Someplace you think is the most fun. It is your body and all.
[ She does genuinely think it'd be cute for Todomatsu to get a little heart tat but she won't tell him where to put it. Put it behind the ear for all she minds if he wants to keep it subtle! But she cannot lie, she is wondering what exactly Todomatsu will do with such a decision. ]
[ I'm in tears I hope this is what the goal was. She's a real one though she really will hold his hand and even pet his hair as he tears up. You are just a little baby... she unironically fawns over soft guys, she just wants to noogie you so bad but you are already suffering from the tattoo needle. ]
Wanna get fries in celebration?
[ Hangover food. And then Todomatsu can consider his decisions today. ]