I'll start:
>Mori & her sister set up a sex party where they offered the participants the chance to run a train on THE Gawr Gura in exchange for money
>They sprung it on her suddenly so the timid and small Gura wouldn't be able to escape or refuse once it started
>Gura was busy getting plapped by multiple men while Mori remarked that she was up to "shenanigans"
>Gura got impregnated as a result, leading to her long hiatuses and reluctance to do anything for holo anymore because of the trauma the event caused her
>She graduated so she can focus on raising her child away from her pimp Mori, leading us to today
This is what happened.