For my first cycle (500mg test-enanthate a week) there wasn’t much change in my diet. I only bumped up my protein by 50g a day, and I made substantial gains in strength/size (from 210 to 230, 12 weeks) without any bloat really. However, I think that this was due to superior-nutrient-partitioning like Bushy said, and because my recovery from training was greatly increased. If I’d eaten more, I’d have gained more, but at the time I was trying to stay within a certain weight-class.
Prior to my cycle, I’m pretty sure I was under-weight because of over-training/under-recovering (2x a day training, judo and kick-boxing, sparring, weightlifting, fieldwork, and running, plus age), and because I just couldn’t get enough “clean” calories in during the day. Looking back, I could’ve eaten more “cheat” foods, but I didn’t want to go back to 10 years ago, when I walked around at 225-230, but I wasn’t as dedicated to my training and diet, and I was carrying around more chunkage. Back then, I was eating less than I did when I started training more seriously, but carrying more bodyweight.
So I’m just adding, that I think your current activity level and kcals burned will also play a part in how well your body responds to AAS and maintenance calories. But unless you have specific goals (like staying within a certain weight-class), you’re WAY better off eating more so you can take full advantage of the AAS.