Well for the regular Dallan the 6 images are the whole kiss scene. As for nsfw if you go to detention while also hanging out with Chelsie enough to get the sex scene, after that you'll get an extra scene about Tate and Aiden in detention. If you're missing more than 2 images for the nsfw Dallan gallery, try different variations for Chelsie's scene, there should be 3 variations. with the slime Nightfallen, without and with his appearance slightly changed.