Kyouai Shinri Paradox

Synopsis

Assistant Professor Yukinari Tachibana is in love with his little brother. He left the house to hide his feelings, but his little brother Takayuki entered the college where he teaches to follow his brother. Yukinari's heart would go fast just by a simple touch from Takayuki, and while he thought he was hiding it well enough that no one would see, one student noticed. "Aren't you crazy to lust over your little brother?" A student from psychology department, Kazusa Ichijou, started to threaten Yukinari... (Source: eBookJapan, translated)