Sasuke couldn't describe it. He'd never felt this way before. All he could think about was the other ninja. He guessed he would of dealt with this better if it was Kasuga, or female for that matter.
Right now he was distracted by the thought of Fuma Kotaro. Not only was he male, but he was a legend. He was unseen by everyone. If Sasuke were to begin to explain to others what he felt no one would believe him.
Kasuga may understand. She had been there that one time he popped up. However, he didn't want to discus the particulars of the relationship. Yet, he really wanted to talk about this with someone. Then again, he was a ninja, it was best to leave things like this unspoken.
Besides, this had been going on too long for him to question details. Like how whenever Kotaro entered a room he was able to since him. Or how even when Kotaro snuck up on him, part of him knew who it was before he could even consider attacking. It's why, on those nights, when Kotaro dropped from the ceiling and on top of him, he didn't flinch. He tilted his head back, to kiss him.
He didn't jump when he felt hands running down his chest and over his scars. He would do the same to find nothing but smoothed skin. There was never even a scratch on the other man.
Eventually he would lie next to Sasuke to fall asleep. Very few words were exchanged like this. Sometimes they would talk when in the field, but other wise their was very little conversation between the two.
At times he thinks it just because they're both lonely, and that's why this works. Or worse case, he was planning on attacking Takada.
In the end he realized that he didn't really care. He was content with this.