after sherlock comes out as genderfluid to john he suggests the two go out to buy some new clothes for sherlock to let him know that he really doesn’t mind and completely supports sherlock’s identity. the day out goes great, sherlock buys themselves at least seven new outfits and john, although he doesn’t know much about fashion these days, likes all of them. but when sherlock wants to go to victoria’s secret to buy some cute lingerie john blushes a lot and says he’s going to wait out in front and when sherlock comes out with a bag john swears he can see black lace and his face is flushed for the rest of the ride home
John and Sherlock getting into an argument after Sherlock rudely deduces someone and John hisses bitterly, "how do I know you even love me, Sherlock? You got engaged to break into an office! Is that why you proposed to me, hmm? Something I have that you want?" and after a moment of silence, Sherlock nods sheepishly. "What, then? What do I have that you want?" and Sherlock finally looks him in the eye and says "your surname."