The siblings, lost in their forbidden game, can't resist the allure of their animated selves. The sister's avatar, her body a lush landscape of digital curves, takes her brother's cock into her mouth, her tongue flickering over the bulbous head. The brother watches, his own cock hardening as his avatar thrusts into her, their bodies moving in sync, their moans echoing in the silent room, a testament to their shared, guilty pleasure.