Mind control

Evil!Sonic x Shadow | Sonadow | R18+

"From the opened door he could see his captor, being that none other than Sonic, wearing that unknown collar with pink glow, which had given him some kind of strange powers."

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This is an AU based on the idea that Sonic actually got evil because of some strange device that gives him more powers than ever, such as the ability to control people's minds. Who else would he try it if it's not with Shadow, his ex lover.