7-9: There's enough of your cum for both women to share & swallow.

Already in a position to swallow your cum, "Rinoa-Sana" takes your dick between her lips. She licks the pussy juices of her older sister, "Neko-Sana" along the way, and strokes your shaft hard and fast, while she sucks hard. As the first spurts of your seeds start to come out, she does her best to leave some for her older sister, while she swallows her share of your seeds. You hold back as much as you can, to allow "Neko-Sana" to take in her share, as she drains you completely. Your dick begin to soften in Neko's hand and throat, and the cosplayer licks the tip of your dick clean, then releases your dick from between her lips. You breathe a sigh of relief, as your dick goes limp, reasonably sore from being inside of two tight pussies. Then you retreat to the bed, while the cosplaying sisters grab their clothes, covering the front of their bodies with their undone pieces.

"Hope you had fun, as much as we did, Alex." Neko tells you, as both sisters kiss your temples. "Rest well, good man. We'll see you on the convention floor when the sun comes out."

You get off the bed as soon as the sisters take their leave, so that you can relock the door. Then you return to the bed, and virtually collapse onto it, falling asleep really fast.

(Roll +2xp for getting both women to swallow your cum. Running total of 20xp.)
(New character moves, for getting experience with handling multiple women: Group Sex & Iron Will -- New base modifier for +Control is 0)