Koori ga Tokeru no o MatteruKoori ga Tokeru no wo Matteru; 氷が溶けるのを待ってる

From Hoshikuzuu Scans: As part of a losing a bet, Mitsuya has to stand at a popular spot for gay cruising. And he is approached by salaryman Saitou and invited to a hotel, where Saitou proceeds to masturbate in front of him.