Shouto is so clingy. Like, unbelievably clingy. The moment him and Izuku's relationship became official and was made public to the rest of Class 1-A, Izuku was almost never seen without Shouto hanging off of him in one way or another. Shouto will hold his hand walking down hallways, hug and hold him while studying or reading, sit on Izuku's lap on the couch from time to time and just,, love him, hold him close and cuddle when they sleep together, etc, etc. He loves intimacy (NOT the sexual kind ya nasties) and feels very touch-starved like 100% of the time. Izuku thinks it's so incredibly adorable and endearing.