Tony quivered, part in horror at the thought of becoming Alex's sex slave, part at his overwhelming horniness and need to piss.
His shaking hand moved the mouse, and closed the file, selecting 'no' on the save dialogue. He went into his brother's room, and silently, shaking, climbed onto the bed, standing on all fours.
Tony felt Alex climbing onto the bed behind him, whispering into his ear as he felt his naked cock at his backside. "Good choice," Alex said, as he entered Tony's rear for the second time that day. This time fully aware of what he was doing. "Of course, this isn't a one-time deal." He slowly thrust in and out. "You're going to be my obedient little pet, earning the right to pee and cum, from here on out." He moaned into Tony's ear as pre started to leave his cock. "If you're good, I'll let you do both nice and regularly, maybe not even forcing you to endure the desperation you're currently feeling. At least, not for long." His thrusts got harder and deeper, as he went closer to the edge, Tony's eyes went wide as he felt his brother's cock starting to vibrate. "If you're bad... Well, imagine having to spend a couple of days like this. That'd be pretty intense, huh?" He thrusted harder and faster still. "And if you ever decide to tell anyone about what happened today, or our little arrangement? Well, there are a lot worse things that could happen to someone as a result of this device you ordered, don't you think? Some of which even someone who turned himself into a desperate, horny, glass statue for an hour wouldn't want."
Alex came, hard, and flopped backwards. Tony whimpered, unsure if in pleasure at having his prostrate rammed or fear at what Alex had been saying. "You wanna piss and cum now?"
Tony simply nodded, a pleading look in his eyes.
"Sure thing, little bro." Alex grinned. "Just one small thing first. Just to make sure we're on the same page about this arrangement of ours."