Should i show my girlfriend the secret fantasy picture i made of her?

That does sound really cute. From the way you described her in the bikini photo it sounds like she could almost resemble a canary or something. Show her, she'll probably think it's really sweet. Be sure to explain that you saw the beautiful birdcage and it made you think of her, and that you think the image you spliced looks innocent and cute. Just to make sure she doesn't think anything ual of it, and I doubt she would anyway. Your brother's stupid, not everything in a guy's head revolves around .