Cosplay Roshutsu Kenkyuukai

Both of these short hentai feature a cosplayer that attracts a lot of attention. Otaku then ask the cosplayer to pose for a photo shoot, and afterwords they whip out their dicks and cum all over her. 

Both anime involve modelling / cosplaying and the main characters, (Aya and Sonico) have almost the same looks. Both anime includes certain events that would lead the female leads to embarassing moments, often involving a large crowd and ridiculous outfits. Both are somewhat plotless and mostly focus on fanservice.