[Saki Rinku] Starting Today, I'll be Going to School Naked 2 [Ongoing]

A girl is forced to attend school naked after a teacher reveals he saw her naked earlier, causing her to blush and feel embarrassed as classmates look on. She is told she must participate in 'sexual relief duty,' effectively becoming available for anyone to use, while boys express jealousy and curiosity about her exposed body. Later, the teacher invites her to a gym storage room for 'proper instruction,' leaving her flustered as she realizes she is thinking about sex.