I asked 4chan and luckily one of them knew the source. The person is Bruce Banner aka The Incredible Hulk in human form.
Edit: Source verified
"In the latest Defenders series, an amusing situation occurs when Umar seduces the Incredible Hulk in order to turn him against his Defenders allies. Unfortunately their tryst proves so completely satisfying to the Hulk, that post-coitally he reverts back into Bruce Banner, much to Umar's disappointment. The experience was apparently so satisfying that even torture was unable to upset him, forever earning Umar the title of "Best Lay in all of Marveldom." "
The man responsible for drawing it
Thread: Itt: Origin of the oh face