"Nnnnnoooooo..... nnnnnooooo...., I can't believe it I lost 3 times now!!!" your shapeshifting girlfriend in 10-year-old boy's form yells out loud as s/he loses 3 times and you're now the champion of the game. "Gggrrrrrr... I shouldn't have pick some characters that could easily beat you."
"Well, poor choice, babe. Anyway, you better be prepare for yourself because you're about to take off your underwear, hihi." you giggles as you're teases her like you teased your little sister.
"You big meanie! *sign* Fine, I guess I have to take my underwear off. Geez, I can't believe I just makes some stupid rules." your transformed girlfriend in little boy's body angrily signs as s/he stands up and begins to strip off his/her underwear right away, plus you can't wait to see what's next. As your former girlfriend finally takes his/her underwear off, you now see there no clothes left in his/her body but completely naked body of the 10-year-old boy. Come to think of it, his/her body is so smooth and nice perfect skin, and his/her little penis is kinda cute for a little boy's body. "There, I hope you're happy to see my naked body." s/he says as s/he look away.
"W...what do you mean?" you ask her/him back.
"Well, just because I lose 3 rounds that makes me strips all of my clothes and leaving me naked so you could make fun of me, huh?" you see her/his gets all red and about to cry, and you also saw her/his attitude and personality is completely different than your former girlfriend, it seems like s/he act like a little boy. Then, you comes to her/him and hugs him/her as you cheer her/him up. "Aww,... c'mon don't be like that, babe. I'm sorry for making you takes all your clothes and it's fine that you don't have to force yourself to strips off, and y'know you're kinda cute when you're a little boy." you confront her/him as s/he looks at you.
"R...really?" s/he replies.
"Really, and I hope you don't mind if this isn't weird to you." you says.
"What do you m-!?" Then you stop your shapeshifting girlfriend in 10-year-old boy's form by kissing her/his mouth. And then, s/he can't hold back and continues to kiss you passionately. "Honey, is it okay to kiss your girlfriend who is in the form of 10-year-old boy?" s/he shyly asks as s/he broke the kiss.
"No, well... maybe yeah, but I want to getting something kinky." you reply as you both smiles.
"So anyway do you mind if we play another games, I could make a new rule. Or do you want me to morphs into somebody else for you to have sex? Or would you wanna sex with this little boy?" s/he asks you.