As far as this thread suggests you are not a sex offender, you are being investigated or possibly prosecuted for an alleged sexual offence. We still have a principle of “innocent until proven guilty” in this country even with such a grievous crime as receiving a dodgy picture with a blackmail threat (Ohrly’s suggestion of organised pre-planned crime seems quite plausible and there could be others similarly affected able to provide support or advice). Get good advice - even better than that available on an anonymous Internet forum - and hope that the law still has some semblance of sense and justice embedded in it.
In the event that you get a disqualifying conviction you can still fly - arguably with more enjoyment than an airline pilot might - you just need to ensure you go down a career path that leaves you enough time and money to do so.
Don’t give up!