Oliver becoming absolutely head over heels in LOVE with Mark after they start 'experimenting'. Mark getting so embarassed because Oliver has started referring to him as 'his boyfriend' during battles with other hero teams
Mark having to explain to Oliver that he cant go around telling everyone about what they have together. That its their secret. And Oliver not understanding why the world would ever have a problem with love if it was real. Mark just having such a hard time explaining why his baby brother wasn't allowed to be proudly in love like when Mark was in love with Eve











