Glad you liked the artwork Steve, you really are a great inspiration though, and it looks like you will remain so for some time to come.
This condom thing has got to be something of a Mexican stand off between the two of you now. Sue saying sex is better than in a long time (not better than ever), the hint that it is almost as good as sex without a condom but she hasn't openly said so (don't think she will either), and her again stating you can have her bareback any time you want it. Before she has said this promise came with conditions, that she would want to 'test' whether you really meant it in some way. Have these gone? Changed? Either way, you seem committed to condoms until she asks you to not use them and she seems ok to use them until you ask her. Who will blink first? And what of her comment earlier that your holiday away would be condom free?
On another level, Sue has finally got everything she wanted. She is now under no threat of timescale to dump her lover and feels no need to 'escalate things for the short time we have left' as she has done so many times before. She can realistically see as often as she wants to, subject to golf and careful planning. She can go away with him by herself for weekends and maybe short breaks. She can relax at his place and have sex exactly as and when she pleases. She can have only him bareback to keep it 'special'. She no longer has her husband saying that whatever phase they are in at the moment is 'temporary' in some way and resisting any of the above. The only thing she needs to do to trade this is sex once a fortnight. No wonder it feels better, no wonder she is grateful for this new era she finds herself in. Meanwhile her husband is trapped in his own condom fetish, telling himself that this means the sex for him is as good as without and proud of the increasing record of says he has gone without feeling her fully. There is still the whisper of the man that was, quietly telling himself maybe not, but that is drowned by the other forces at play and increasingly diminishing. All the while, the emotional bond which exists between Sue and Paul is increasing, slowly tying them together in quiet silent ways, bonding in new shared experiences, in great sex, and in those quiet tender moments after it. Sue may insist she still loves you Steve, but there are many shades of love, and in some of them she already loves him more that you. Moreover these tendrils of bond are still slowly growing, and will continue as Sue goes away with him over the summer. Beware of them, not only because Paul stays a threat (albeit controlled at present) to your marriage but because Sue may come to realise that what he gives her, she can no longer ever do without and she clearly already believes she can no longer get from you. She may well come to believe that she has one last chance in life to find everything she needs in a man in one package, subconsciously she may already be looking, and that man will not be called Steve or Paul.