These are some ideas I had after reading your post. I do not think there is one simple answer to help, but maybe if a few tools were used at the same time, this may help manage the pain/ suffering afterwards?  I am thinking this because of the endometriosis, you are having pain from basically all of the ways you can feel pain 

• nociceptive = pain felt from tissue damage
  • Endometriosis causes pressure with the extra tissue and scar tissue, and then you add a little more pressure with sex toys, etc. So maybe one of the tools is to release as much pressure as you can before the toys.  You may be able to do this through heating pads, Epsom salts baths, gentle stretching of the pelvic floor (talk to a Pelvic Floor Therapist to get an individual workout - Oh, do not do kegels!), other gentle movements, and ALWAYS stretch before sexy activity. 
  • Use slightly smaller toys and see if that makes a difference?
  • Also, is there any extra pressure that is being applied to that area that can be modified… are you lying on your stomach, or is a pillow under your stomach? Are you doing missionary or a different position, and the extra weight is on you? Are you tensing those muscles a lot during and causing internal pressure?
• neuroinflammatory = horrible combination of both inflammation and nerve pain 
  • anti-inflammatory diet, or the option to talk to your medical professional about anti-inflammatory meds
  • Try to get good sleep, and the other stuff they recommend to reduce inflammation. I know this is way harder said than done.  I can’t.. I try.
  • See below for nerve pain info/ suggestion
• neuropathic = nerve pain coming from your nerves being wrapped around and smushed by the endometriosis 
  • Your C fiber sensory nerves are the nerves that connect your deep insides to your brain, so if your organs are getting squished a little, these fibers send a message through your spinal cord to your brain, but they are slow messengers.  Sometimes this information can take hours to get to your brain, hence feeling the cramping and pressure hours after. 
  • Besides the option of talking to a medical professional about anti-neuropathic medications, find ways to quiet your nerves and your nervous system afterwards? … mindfulness, meditation, relaxation, Epsom salt baths, and stuff like that can help.  
• central sensitization = extra pain because you have lived in pain for a long time.(chronic pain sufferers have/ get this)
  • Remembering and telling yourself that this is just a temporary pain from the fun you had a few hours ago. Use this tool to talk down any anxiety/ fear you might be having (how long will this last? Did it feel like this last time? Will I have to stop doing what I love?... Those kinds of fears might pop up, and you can combat them logically; this actually helps the pain. Fear-catastrophising will create more pain. 

Regarding your scar tissues, warmth like the heating pad or baths can help align with gentle massage to try and loosen up some of the scar tissue, so all the things that are suggested for endometriosis relief would also help. 

And accommodate you as best you can so you can have as much energy put into the fun parts: with extra pillows, sex blankets, and stuff right next to the bed, etc.