Yes he was honestly. But I did like the interaction between he and his nii-san. I thought it redeemed him a little. And if someone made an unwanted pass at you, wouldn't you avoid him at all costs? Well, not me as I would call my drunken cousins to go and teach him some manners, but...........
That's what made him realistic. He's not overly weak or strong but neither innocent and clueless. Everyone needs help as they learn new things and when people come on too strong, human tendency is to avoid, not confront.
didn't you read, notice that his sempai sexually harassed him, almost raped him and twice?!?! any person in his right mind would react the same way good grief. his sempai broke and betrayed their work relationship bonds. Naoya did more, he prevented Tsukasa from beating the perv sempai and any situation that would create problems for the company and also kept his work relationship with him when he shouldn't.
how to say it... i think this is not a bad story, but i don't really like the uke. his senpai helps him a lots at work, even if it's for personal reasons, but still. and then when the uke received his confession, he acted like his senpai is some kind of freak homo, and even avoids him like... avoids some perverted :p