Sorry to ask, but my search efforts have turned up nothing. Do any of you know about a hentai manga where a guy finds his classmate's phone and it's full of nude pictures of her and he tries to blackmail her, but it turns out she wanted him to blackmail her? Sex of course ensues.
>>15067831
My man, blackmail is one of the most common tags for hentai along with school themes.
Based on what you provided you get around ~3000 results on popular h-sites.