Namechaged obviously. Just in case I am BU 
This morning, ds (20 months) was in bed with me as usual - he wakes at 4 am, comes in my bed and goes back to sleep for another couple of hours.
And, as usual, we started playing etc after much jumping, he performs his favourite thing and lifts up my top to blow raspberries on my tummy! Cue huge giggles from both of us :o
After repeating many times he lifts my top higher then normal and exposes on of my breasts. With that, he has a stupid grin on his face, giggles and presses my nipple with his index finger saying 'beep' (this is what he does when pressing the button at traffic lights)
We both dissolve into giggles and he repeats it 2 or 3 times before I pull my top down and tickle him. I stopped because a) he was getting rough with his excitement and b) it was too cold and said nipple was in danger of freezing off!
Now,I just recounted this mornings antics to my sister and she was horrified!
She said it was 'highly inappropriate' 'perverted' and surely going to set him up for some kind of mother complex.....
She warned me not to tell anyone else because it would seem like abuse and SS may get called 
Is she right?
Am I just not seeing how wrong this was?
To me it seemed harmless fun and it's not like I intend to make this part of our morning routine and still whip my boob out when he's 5!