Toshishita Kareshi No Renai Kanriheki

Satoshi is a fragile research student who immerses himself so much in his research, that he often forgets to eat and sleep. He has a pet-master relationship with Izumi, his junior at the same lab, a relation which they themselves and people around them are aware of. Izumi's supposed to limit himself in taking care of Satoshi, but after he learns that he was attacked by a man, his feelings towards Satoshi started to change. These feelings are possessiveness and a desire to monopolize or?