do the normal route (making the perposal,staying in the closet but don't take off your brooch win the card games and chose the tea), one the last day,go find them in the morning and skip the dialodge and there will be an optoin to hide shadow milk in the libary there you'll get the pure vanilla photo ablum (aka the pure vanilla star) i think that's how you do it (haven't tested that out tho i got the ending)