Anashtu grunts and growls like animal, his lips locked on sensitive muscle on her wing so she could not much smack her brother with it, but other wing could but they lacked any strenght to harm him. They more served as encouragment to<em>fuck her harder</em>. In reversed cowgirl position he forcefully lifted her up and smacked down on his cock, which rammed against and through her cervix, stretching it out with his deep hammering thrusts and sloshing his cum around inside her womb. While gargling and suffocating her with dual tail deep throat penetration and muffle her cries and any angry words she may have. As her cheeks started turn soft pink in color he growled and gushed another load inside her!<br/><br/>Already maximum in magic, the magic<em>overflow</em>on her! Making her body gush out the extra magic as milk from her enlargened teats and squirt out from her sex in a strong potent succubi juice spring! The lab assistant was nearly passed out from fierce self-masturbation but even in such catatonic state she thought she should store up the juices, as both succubi milk and lust juice when they are overflowing in magic can wake up dead with a boner. Extreme potent aphrosidiac, which to incubi are resistant and not driven mad.<br/><br/>But rather encourage her dear brother give her more serving of his fierce demonic cock! Anashtu releases her wing from grip of his suckling mouth and growls;<strong>"Still wanting more? Such cock greedy sister I seem to have."</strong>Of course the cursed suit on her had made her orgasm again....but yet yer body grasped and milked Anashtu's cock for<em>more</em>! Despite what her mind or stamina actually indicate! The cursed magic already perverted her body to yearn always for more!<br/><br/>Anashtu changed positions agains, this time shoving his sister forward so her enlargened tits pillowed her landing on soaked lab floor, placing hand on her delicate horns, taking firm grasp on them as his cock then soaked on her and his juices, thrusts inside her ass! Starting meaty firm but steady smacking thrusts which slam his thighs firmly on her buttocks and grinding her teats against the floor and her hard nipples, soaking her body with her own lustful succubi juices while holding on horns angling her body tightly....both to receive ramming to ass and also allow dual tails go bit more deeper into her mouth, spiralling and squirming inside her mouth and throat and let her drool without shame drip from corner of her mouth down to floor. Her own drool helping coat the tails and ease the passage deeper down on her throat. Forcefully fellating on both her own and his tail which add their own perverted pleasures atop the penetration.<br/><br/>Sooner than later her brother cums again, again, and again. He came twice on her ass and then he forced her twice to drink his cum while he used his tail drill her cunt and forced her own tail fuck her on the ass (by his hand) as he skull fucked her. Overall five times overloaded her body with magic, reaching her maximum level of magic power but unable unleash or use it anyway. Once done her brother then just send her cum soaked sister through teleport spell just bit outside his domain and kingdom, on near the path where slave sellers travel and likely find her soon after being fucked silly by her brother. Once teleported the ropes unbind her and return to default mode.<br/><br/><div class="spoiler_container"><div class="spoiler_header" onclick="hideSecond (this);" role="button">Effect of overflow</div><div class="spoiler_body">For beign fucked silly by incubi (a male demon of high magic potential) you have six metamagic charges able to use metamagic freely (if have any metamagic feats that is). These charges can be used in place for not using higher spell slot and cast them without additional cast time (so empowered magic missile takes actually a 1st level slot and spending 2 of these charges). Without spending them 1 charge fades away in 1 hour.</div></div>