Your choices, in order:
start : You have a magic pencil that can draw and erase things IRL. You drew by accident Emma, a 35 cm tall woman that explained you everything
keep Emma : to thank Emma, you drew her wings and made her a island house painting for her to live into.
go meet your girlfriend : you have shown her the power of the pencil, by giving her an extra pair of boobs, that you promptly deleted per her request.

Sandra is almost jumping for the excitement, her eyes sparkling in anticipation: «Can you draw me more arms. I would always have wanted to have six arms. I will make it worth your while.»
«Oh, sure» you say, after which you start drawing. As you finish to draw each arm, thinking about Sandra controlling them as you draw them, you see color flush into them, after which Sandra flexes them «Wow! I can control them easily, like I always had them. I feel like ants crawling on them in the beginning» she says, shaking one of them «but the sensation goes away quite soon.