A modified version of the Double Cowgirl position, the Doubling position uses one person's body as the focused pleasure point for everyone involved. However, unlike the Double Cowgirl—where every person receives genital pleasure from the sex position—Doubling provides genital stimulation to two of the three participants.
To get into the Doubling position, the bottom-most partner should lie down on a plushy surface. From there, the person who will receive oral sex from them will squat over their face for easy access. Finally, the person who is providing oral sex to the bottom-most partner can get on all fours between the bottom partner's legs and get busy.
We understand that this position may be completely inaccessible to you as a result of your disabilities and/or chronic pain condition; and we strongly recommend you have a conversation with all parties involved before attempting this.