"Sweetie, I think we should turn into another people again."
"Aww, but I'm like, just about to start to enjoy my brother, mom." your transformed girlfriend/sister pouts and hugs you. "Can you just please like, let me stay in this form?"
"Absolutely nope, young lady. Like I said before, we should turn into another people." Claire said as she acts like your mother giving your shapeshifting girlfriend in the form of your sister. "And because you turned me into his mother, that means I order you to change us so we can please him."
"Okay, mom. I'll like, going to change you and me." your girlfriend/sister said in her disappointment. Then you give her a passionate kisses on each other lips to cheer her up. "Aww thank you, brother. You're like, such a good brother." she responds as she continue to kiss you deeply. "Would you be disappointed that you like, your cute 'sister' turn into another girl?"
"Not to worry, 'sis'. I won't." you reply and then hug her. "Anyway, our 'mom' is waiting for you, why don't you both shapeshift while I watch you?"
With that, your girlfriend/sister and Claire/mom stand up together as your girlfriend/sister uses her shapeshifting power to morph with Claire once more. You starts to wonder who are they going to turn into this time?