I actually feel guilty now after D most likely saw the MC having sex with Elena, alluded to by hearing the creaking door.
I can see one of two possible outcomes.
1. D now feels she and her father are in an "open relationship" and has sex with another guy. Hopefully not the photographer that I just wanted to bludgeon with his own camera. Probably opens the door for Martin or Graham.
2. D who suffers from poor body image has been made to feel even more inadequate after seeing her boyfriend banging her bestie. I think that's what made me feel guilty. After building up her self-esteem you potentially just pissed all over her kittens and made her feel bad about herself again.
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I actually thought of a cruel teaser for the next update based around D having seen the MC and tiny titty Elena preforming coitus.