First of all, congratulations on your reboot. 120 days is no small feat and you should be extremely proud of yourself. I envy you. Second, are you cumming involuntarily due to thoughts or are you actually touching yourself? If it is the latter, you need to stop immediately. The brain wants you to relapse and enabling it will only make things worse. If it is the former, then I wouldn't worry too much, honestly. It sounds as though your brain is desperately trying to get you to relapse to porn and even the slightest hint of stimulation makes it antsy. Don't fantasize about porn or using. It'll only make things worse. If you're simply cumming involuntarily due to thoughts or slight stimulation, then I imagine that it will go away in time. The brain wants what the brain wants and it will do anything to get it. As long as you aren't using porn, you brain will continue to improve. Finally, don't become discouraged. Don't view this as a failure or an end to a streak because that will only lead to depression and guilt which will send you down the rabbit hole of relapse. Everyone falls down at some point during a reboot. The important matter is whether or not you pick yourself back up and continue. Learn your triggers and think about what you could have done differently and can do moving forward. You'll be ok. I'm rooting for you. Good luck.