Surprise surprise

My wife tried to fuck me last night . I offered to run her a bath and about 10 min later she came out straddled my groin and dry humped me . I got my hand in under her undies and felt how wet she was but whe I suggested changing positions she complained about her sore back , I asked for a blow job, sore back, I asked for her to wank me, sore back. Fuck me. She went of to bed with the shits and I had a wank that was 3 for the day pretty good for a 40 yr old