Lizzie furiously grinded Cassie's crotch, as feelings of love and happiness danced in that vast brain of hers. She was going to do it. Cassandra was going to be her girlfriend.
Cassie bestowed upon the ring, and practically shouted: "I wish that both Lizzie and I had the absolute highest IQ imaginable, with powers to match!"
Lizzie was so fucking horny from hearing that. Their brains expanded, filling up with every single last bit of knowledge there ever was to know. New neurons appeared and strengthened, and old ones multiplied like horny rabbits during mating season. Their craniums ballooned to fit their giant throbbing brains. They pulsed and throbbed at almost a perfect rhythm, and both Lizzie and Cassie only had one thing left to say to each other.
Crying tears of joy, Lizzie mentally conjured up a genuine diamond ring, the first of many, many, many things done with her near-infinite intellect. "Cassandra.... I think I love you. I want you. I want nothing but you! Will you please marry me?"
Cassie looked on, awestruck. "Lizzie Watson..... you bet your life I'll marry you!!!" No matter what happened, these two will never be separated. The two girls made out with more force than ever before!
When all that was said and one, Lizzie turned to her soon-to-be wife and said: "Cassandra, darling, I want the two of us to have..."