You grip the diaper in your hand, rubbing your palm along the material. You gotta investigate it and try it on. You strip down, discarding your shoes, pants and underwear off to the corner of the room. You feel the surprisingly cold air against your junk and shudder, hurrying up and sliding on the diaper. Much to your suprise the brief feels really good against your cock, feeling the oily surface coat the surface of your organ, feeling your penis stiffen as it rubs against it. You feel the warm leaking precum, dribble down your leg, you can't stop yourself, you reach your hand in and jack off furiously. Stroking and stroking your erect cock, awaiting your climax. But you feel something else happen, your bowels begin to churn and you feel it on its way out, in such massive force there's no way to stop it. You have no choice but to release it into your diaper, filling it with warm shit. You don't feel embarrassed though, it only makes you feel better as you coat your hand and cock in scat, only adding onto your raging hard on. You continue to masturbate furiously and loudly as you near the peak, letting out a loud moan of excitement and pleasure as you further fill your shit filled diaper with your cum. You feel your bowels begin to churn again but this time you don't even try to stop it, you just push your giant load into your brief, grinning as you do and you only keep grinning as you notice the dark fur now growing on the shit covered hand spreading all over your body, as you transform into a monstrous new form to accent your new bowels.