Is this incest?

To be clear my daughter is legal age.

I am a single dad for several years now. My wife died of cancer when my daughter was a little over 11 years old after fighting a losing battle for 2 years.

I tried my best to be a dad and mom to Sara and my son (who isn’t involved in this). For the 2 yrs she was sick my wife tried to train me for the job. I don’t know if this is relevant but I am trying to add context to explain mine and my daughter’s close relationship.

Fast forward several years and my daughter becomes a t33n mom whose baby won’t take to the breast and she becomes engorged. She tries everything to express her milk to release the pressure, even asking me to try and manually express her milk as she didn’t seem to be able to. Her mother had the same issue and there had only been one way to give her relief.

My daughter asked me in the middle of the night between sobs from the pain “Did this happen with Momma?

I told it had and the only thing that worked for her mother was me nursing on her. I drained the pressure by drinking her mother’s breast milk. Sara asked if I would for her “It hurts so bad Daddy” she said looking at me through tear filled eyes.

So I did. I took first one breast into my mouth and drank my daughter’s breast and than the other. She moaned from the release and whispered thank you in my ear as she held me to her breasts.

We have never kissed, fondled or fucked each other. There is no second any kind but I nurse from her 3 times a day if the baby doesn’t latch.
I left my daughter’s nudes on my profile, she likes to be seen