Anata Dake wo Matteru

Shirasawa, who sought a lover he could be dependant on, always dated married men old enough to be his father. At such a time, appears Nakatani, a student at the cram school he used to work part-time for. Nakatani passionately tells Shirasawa of his love for him, but Shirasawa doesn't seem interested in having a relationship with younger guys...
(from B-U)