its normal for the dick to be sore afterwards
i get that too.....cuz once you cummed all...you need to regenerate

i can cum like 3-5 times a day if i wanted to......and i'll get pain at the end of the 5th time
but sometimes
one day i finish cumming once...it'll hurt

i guess it depends how much cum you still have in the system

honestly, don't worry about it