One thing that people who utilize that stance like to do is to shoulder roll/deflect straight punches with the lead shoulder (right hands especially). Sometimes they will return fire with their own straight right or right uppercut (easier to deal with) and sometimes they will throw an immediate counter left hook either to the liver or head (harder to deal with if they have really good timing).
If they like to roll/deflect with the lead shoulder, then make them do it. Throw your right hand (either as a lead or after a jab/couple jabs) and immediately after (at the point where your punch makes contact) "pivot in"/take a step with your right/rear foot diagonally forwards to your right (imagine you are standing on a clock, normally your right foot would be somewhere between 5 and 4 o'clock, you want to step to around 2:30-3 o'clock) and slip your shoulders to the right at the same time.
If you do this correctly your opponent will miss their counter right hand (regardless if it's a straight shot, overhand, or uppercut) or you will wind up with an angle on your opponent if they don't immediately counter. If they do throw the counter right you can throw your own straight right hand either to their head (if they drop the left hand when they throw their right) or to the chest/arm to balance punch them if they keep their left up well and then follow with a left hook to either the head or body.
If they don't throw the counter right then the superior position you have gained should mean that your left hook will slip between their hands to their head or between their elbows to their body. A couple good combos here are:
1) left hook to the head (which will generally bring the arms to the front to attempt to block the hook, right uppercut to the chin (even if they manage to block the left their elbows will now to up leaving you room to come up under the arms to hit the chin/aim to actually hit their chest with the uppercut and your punch will naturally slide up the chest to the chin), they a final left hook either to the head (possible KO) or to the body (which can definitely hurt and will wear the opponent down, but could actually wake the opponent up if your uppercut KO'd them).
2) left hook to the body (generally causes the arms to drop and come to the center), straight right or 45 over the crease in the elbow to the head, left hook to the head or body
If the opponent likes to throw a left hook with their shoulder roll ala Lucia Rijker, then draw their left hook counter/fake your right hand to get them to throw it, then block/check their hook with your right arm and immediately counter with your own left hook to the head or body or right hand to the chin (depending on the angle).
After you do this to them a couple times they will think twice about shoulder rolling, you can start faking pivoting in to draw the opponent into trying to follow you and then repositioning back to your original position and catching your opponent in transition/in a more squared position relative to yours where they will be easier to hit.
You can also try using a "checking/turning hook" to their lead elbow/tricep while you pivot in to prevent your opponent from following you and slightly knock them off balance in the process if they are turning with you.
All of this requires one to be able to move dynamically and skillfully in any direction though, so make sure that your footwork is solid. You will also need to practice this quite a bit and have a solid jab/entering skills to be able to utilize this effectively in actual sparring.
Hope this helps.