She must be jealous of that pillow, lol.

It's rather that she doesn't want her to have a pillow with a lascivious picture of herself on it. (Keyword: awkward)

I think she sees the pillow as a threat, also she is jealous Yuugi would hug it so openly(though she will never say it out loud)

oh Parsee, what seriousl self esteem issues you have, but we still love you for it.

I would so buy a Rex K hug pillow, if for the art alone.

She is [Green-Eyed Jealousy] of the pillow.

parsee realized there was a nude version of her on the backside of the pillow