All you can do is work on getting that erection down. Its all a state of mind that you need to work on, its part of the PE process. Every time I workout I’m in a state of maintining a certain erection level. Either trying to increase or decrease. One way to get my erection level down is concentrate on breathing correctly. I know this sounds stupid but the point is to focus your attention away from your dick until your erection begins to subside.