Senku understood the concept, and had seen it applied, at least terribly in his opinion, by Taiju and Yuzuriha.

He didn't quite make the connect that if he substituted things like cookies to cola, and secret messages instead of letters left in lockers like a schoolkid, that Senku himself met all the criteria when it came to Gen.

He huffed, a bit amused. "You can't be married to science. Pretty sure that wouldn't be legal." He turned to smirk at him a little bit.

"Constellations as a love letter? There's an interesting thought..." He hummed, considering it.