Quick afterthought: As far as offering a second prey item (still not recommended, but IF you do) it's safer to feed items one right after the other, with the second one no more than an hour after the first. This is because digestion has started on the first, & introducing another item later than an hour can cause a regurgitation of BOTH items, due to the interruption & insufficient digestive enzymes for the second item.
This is the main reason to just avoid feeding 2 items- regurgitation has risks for snakes, they don't do this easily (they can aspirate material into their lungs that can actually kill them), & even in a best case scenario, regurgitation dehydrates them & means you won't be able to offer food again for at least 2-3 weeks while they replenish their digestive enzymes. If your snake is on the thin side already, this truly is a set-back they don't need.