It's normal. Usually when girls haven't cummed for a while, there will be blood mixed in with the cum. It's normal for the clit to get tighter and since it is sensative that will happen. I am sore after getting oral for a little bit because I just end up cumming hard.
I will do my best to reply with an educated, humble and honest answer. Ultimately, it is up to you whether you want to listen to my advice or ignore it completely. Sometimes, my advice may be wrong; occasionally, it will be right. Regardless, I want to do my best to give people answers they are seeking.